Drill-rotating means for percussion-hammers.



E; L. UPSON.& H. w. PLIISTEN.

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Patented Dec. 14, 19l5.

UNITED STATES PATENT oEEioE.

EDWIN L. U'PSON,'OIl BROOKLYN, NEW YORK, AND HENRY W. PLEISTEB, 0F WEST-FIELD, NEW JERSEY, ASSIGNOES TO HENRY B. NEWHALL, OF PLAINFIELD, NEW

JERSEY.

Specification of Letters Patent.

Patented Dec. 14, 1915.

Application led April 8, 1918. Serial No. 758,657.

T o all whom it may concern.

Be it known that we, EDWIN L. UPsoN, a citizen of the United States,residing at Brooklyn, in the county of Kings and State of New York, andHENRY W. PLEIsTER, a citizen of the United States, residin at Westfield,in the county of Union and tate of New Jersey, have invented certain newand useful Improvements in Drill-Rotating Means for Percussion-Hammers,of which the following is a speciication. U

Our present invention relates to an improvement in ercussion hammers of.the type disclosed in our pending application, Serial No. 719,735,filed September 11, 1912, and more especially pertains to means forautomatically rotating the drill or cutting member between blows in lieuof turning the tool itself by hand, to prevent the drill from cuttingcontinuously in one position. By means of partial or intermittent stepby step rotation, and under impact of the hammer, the drill is caused tocut into the stone faster than where the force is applied in one place.

In the accompanying drawing, Figure 1 is a sectional view of our devicetaken on the line 2-2 of Fig. 2, and Fig. 2, is a section of our devicetaken on the line 1-1,

Fig; 1.

s in said application we provide a housing 4 with av tubular extensioncontaining a tool-passage 40; a hammer 8 operable therein whose innerend is guided by a link and which contains a cam slot 17; anenergystoring spring 7 strained between said hammer and an abutment onthe housing; and hammer-retracting and releasing means comprising a shat 3 revolubly mounted in said housing, a crank 6 (or other powersupplymeans) connected with said shaft and fixed thereto by a pin 5 (orotherwise) a cam disk 1 formed with a plurality of disk cams 2 adaptedto pass through the slot 17 of said hammer, engage and disengage theinner cam wall thereof, retract the hammer and strain and store energyin said spring and release the same, to strike blows upon the drill orcutter 23.

In our present invention the shaft 3 is operably connected with androtates the drill. To this end we revolubly mount in the tool passage 40of the housing extension, a tubular tool stock 18 in which the hammerhead plays and is guided and having an outer polygonal (square) socketthrough which the square tool-shank extends, to receive hammer blows,and a lar er inner tubular head 13 by whose shoul er the stock isconfined in the tool passage and on whose exterior are formed aplurality of alternating right and left hand thread sections oroppositely inclined helical or stock cams 14 and 14 respectively; fix aneccentric 9 on the shaft 3; and strap thereto an eccentric cam rod 10,whose offset reciprocating end 11 plays in a slot 41 formed in thehousing 4 and bears on its inward and outward faces respectively, adriving cam 12 and a pin 16, the former adapted to alternately engagethe oppositely inclined helical or stock cams 14 and 14'* and rotate thetool stock and tool; and the latter engaged and guided in a straightline by a guide, 15, formed in the cover plate 42 of said slot 41.

To insure operating engagements between the driving cam 12 andsuccessive helical or stock cams 14, 14", 14, in their order of action,and rotation of the tool, the stock cams are axially stepped so thattheir anterior ends can pass the driving cam 12 and are angularly solocated that the angular distance between the posterior end of one andthe anterior end of its successor is less than the angular measurement,referred to the axis of the stock, of the cam faces on said driving cam12.

When the eccentric rod 10 is moved outwardly, the face 7) of its cam 12is thrust against the face of a right-hand stock cam 14 and turns thestock and tool, clock-wise, so far that the anterior end of thesucceeding left-hand cam 14 is moved across the path of the driving cam12 and therefore, on its in-stroke, its face n is pulled against theface of said stock cam 14'* and again turns the stock and toolclock-wise and so far that the anterior end of the succeeding right-handstock cam 14 is moved across said ath; and thus the stock and tool areturned intermittently continuously by the shaft 3.

If the driving cam 12 were cylindrical the adjacent ends of successivestock cams would have to overlap and their angular separation to benegative in order to secure successive operative en agements. By makingthe cam faces p an n of the driving cam 12 divergent planessubstantially parallel with the faces of their respective co-actingstock cams 14 and 14, We are enabled to makeV said angle of separationpositive, the stock cams more open and their faces more ascessible sothat they can be easily cut as screw-threads.,

To cheapen first cost and maintenance the tool stock 18 is made of threeparts, namely, its hammer guiding body integral with the cam-bearinghead 13, a ferrule 19 and a tool retaining cup, 27.

The ferrule 19 contains a polygonal socket for the tool shank and ismade fast in the stock extension 18 by threads 22 and set screws 20, 21.Said parts are then entered from within the housing into its tool stockpassage 40, and a bushing 24, screwed into the outer end thereof,axially confines the 20 tool stock therein by means of the co-action ofthe shoulder ofthe stock head 13 with the shoulders 26 of the housingand the adjacent ends of the stock body and bushing 24.

Thereafter the tool 23 is inserted in its 25 socket and the cap 27 isscrewed on the ferrule 19 and forms therewith a chamber 28 in which thetool collar is confined but with operative clearances. The tool shankextends through the holder 19 into the path of the hammer which cannotstrike the tool holder 19 because of clearance, 29, between them.

The hammer 8 being link-guided at its butt and socket-guided at itshead. it is necessary that the hammer socket in the tool stock 18 beeither inwardly enlarged or made with considerable clearance. toaccommodate the hammer motion; either mode can be used; but because thestock is rotated about the angularly fixed hammer, its forms must besymmetrical.

With the exception of the description of the eccentric. the lower toolholding portion for the drill shank` and rotating means, the operationof the tool is substantially as described in the previously mentionedapplication co-pending herewith.

Having thus described our invention, we claim:

1. In a percussion tool of the class described, a housing` aneccentric-rod guide therein and a tubular-extension thereof containing atubular passage: a tubular tool stock revolubly mounted in said passageadapted to slidably mount and angular-ly position a tool. andalternately-oppositely inclined substantially helical stock cams on saidstock: a hammer adapted to be reciprocated in said tool stock and havingadiacent 6 to its butt a cam slot provided with an inner cam wall: meansfor guiding the butt of said hammer substantially co-axial with saidstock: an energy-storing spring strained between said hammer andhousing; a shaft revolubly mounted in said housing and having fixedthereto an eccentric and a cam disk and on said disk a plurality of diskcams adapted to traverse the cam slot in said hammer, engage anddisengage the inner cam wall thereof and retract and release 1o saidhammer; an eccentric rod connected with said eccentric and on said rod apin adapted to engage said guide in said housing, and a driving'camadapted to successively engage said oppositely inclined helical stockcams.

2. In a percussion tool of the class described, a substantiallycylindrical housing, a radial extension thereof containing a tubularpassage, said housing having a slot formed adjacent to and parallel withsaid passage, and a cover plate covering said slot; a tubular tool stockrevolubly mounted in said passage adapted to slidably mount andangularly position a tool and alter- 85 mately-oppositely inclinedhelical stock cams on said stock: a hammer adapted to be reciprocated insaid stock, link-guided at the butt and having adjacent thereto a camslot provided with an inner wall; an energy-storing spring strainedbetween said hammer and housing; a shaft revolubly mounted in saidhousing and thereon an eccentric and a cam disk, the latter having aplurality of disk cams. said disk cams adapted to traverse said hammerslot. engage the inner cam wall thereof and retract and release saidhammer; an eccentric rod connected with said eccentric and a guide and adriving cam thereon respectively adapted to guide the end of said rodand to successively engage oppositely inclined helical stock cams andintermittently turn said stock.

3. In a percussion tool of the class de scribed, a housing, an extensionthereof containing a. tubular passage and an eccentric rcd-guide, atubular tool-stock revolubly mounted in said passage, a plurality ofhelical cams on said stock. a hammer slidably mounted in saidtool-stock. hammer operating means. a shaft revolubly mounted in saidhousing, an eccentric fixed to said shaft, an eccentric rod connected tosaid eccentric, a pin on said rod adapted to engage said eccentricrod-guide. and a driving cam on said eccentric rod adapted tosuccessively engage said helical cams thereby to turn said tool-stock.

4. In a percussion tool of the class described, a housing, an extensionthereof containing a tubular passage; a tubular tool stock revolublymounted therein adapted to slidably mount and angularlv position a tool.and a plurality of oppositely inclined stock cams formed on said stock;a hammer; hammer extruding means connected to said hammer, a drivingshaft. hammer retracting means rotatably mounted on said shaft andindependent of, but adapted 4to engage, said hammer to retract the same;and a driving 181 1,1as,71a

cam operably connected .with and adapted to be operated by said drivingshaft and to coact with successive stock cams aforesaid and turn saidstock intermittently through different angles.

5. In a percussion tool of the class described, a housing, an extensionthereof containing a tubular passage and an eccentric rodguide, atubular tool-stock revolubly mounted in said passage, a plurality ofhelical cams on said stock, a hammer slidably mounted in saidtool-stock, means for advancing said hammer, a Shaft revolubly mountedin said housing, an eccentric fixed to said shaft, .retracting meansfixed to said shaft for retracting said hammer, an eccentric rodconnected to said eccentric, a pin on said rod adapted to engage saideccentric rod-guide, and a driving cam on said eccentric rod adapted tosuccessively engage said helical cams thereby to turn said tool-stock.

6. In a percussion tool of the class described, a housing, an extensionthereof containing a tubular passage, a tool-stock revolubly mounted insaid passage, a plurality of helical cams on said stock, a hammerslidably mounted in said tool-stock, a driving shaft, hammer retractingmeans fixed to said driving shaft and independent of, but adapted toengage, said hammer to retract the same, an eccentric fixed to saidshaft, an eccentric rod connected to said eccentric, and a driving camon said eccentric rod adapted to successively engage said helical camsthereby to turn said tool-stock.

7. In a hammer of the class described, a housing, an extension thereofcontaining a tubular shouldered passage, and a bushing in the outer endof said passage; a tubular tool stock revolubly mounted in said passage,axially confined therein by the engagement of shoulders formed on saidstock with shoulders formed respectively on said stock and bushing,containing a tubular hammer socket and a polygonal tool socket andformed on said stock a plurality of oppositely inclined stock cams; acap detachably connected with the outer end of said stoc and formingtherewith a chamber adapted for a tool-shank collar and to looselyretain a tool; a hammer having its head operable in the hammer socket ofsaid stock and in its butt a cam slot provided with an inner wall; anenergy storing spring strained between said hammer and housing;operating means to operate said hammer and a driving cam operablyconnected with said operating means and adapted to successively engageoppositely inclined stock cams aforesaid and turn said stock.

EDWIN L. UPSON. HENRY W. PLEISTER.

Witnesses:

FRED. J. DOLE, JOHN MORRIS.

